Just to add a little bit. In my experience, perl programming requires a certain type of mind. I cannot define it very precisely, but not everyone can "think in perl". Those who can, basically, have a huge advantage over those who cannot, but that naturally limits perl adoption somewhat. I think that more people can think in java than in perl.
I would hope that as long as use of perl is substantial, it will remain a viable platform that I can enjoy and use to live and make money. I do not care if perl is "very popular", or just "popular", I will be happy as long as it is "viable". Igor